17. We know that college enrollments drop by 10% when textbook prices
double. This means that as the price of textbooks increases, fewer
people attend college. This is a standard definition of complementary
goods, so the cross price elasticity must be negative. More than
that though, we know a doubling of price (a 100% increase) leads
to a reduction in enrollments of 10%. From the general formula
for cross price elasticity we have:
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